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Usage guidelines
Heap memory comprises fixed-sized blocks such as 16-byte or 64-byte blocks. It stores data and
variables used by the user process. When a user process starts, the system dynamically allocates
heap memory to the process.
Each memory block has an address represented in hexadecimal format, which can be used to
access the memory block. You can view memory block addresses by using the display process
memory heap size command, and view memory block contents by using the display process
memory heap address command.
Examples
# Display brief information about heap memory usage for the process identified by job ID 1.
<Sysname> display process memory heap job 1
Total virtual memory heap space(in bytes) : 2228224
Total physical memory heap space(in bytes) : 262144
Total allocated memory(in bytes) : 161576
# Display detailed information about heap memory usage for the process identified by job ID 1.
<Sysname> display process memory heap job 1 verbose
Heap usage:
Size Free Used Total Free Ratio
16 8 52 60 13%
64 3 1262 1265 0.2%
128 2 207 209 1%
512 3 55 58 5.1%
4096 3 297 300 1%
8192 1 19 20 5%
81920 0 1 1 0%
Summary:
Total virtual memory heap space (in bytes) : 2293760
Total physical memory heap space (in bytes) : 58368
Total allocated memory (in bytes) : 42368
Table 71 Command output
Field Description
Size Size of each memory block, in bytes.
Free Number of free memory blocks.
Used Number of used memory blocks.
Total Total number of memory blocks.
Free Ratio Ratio of free memory to total memory. It helps identify fragment information.
Related commands
display process memory
display process memory heap address
display process memory heap size
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